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. 2022 Apr 11;50(6):1475–1481. doi: 10.1007/s15010-022-01817-8

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Fig. 3 — Competitive ACE2-receptor binding inhibition by sera of COVID-19 naïve controls after first vaccine dose, after second vaccine dose and after 6 months of follow-up, and of COVID-19 convalescents prior to booster vaccination, after booster vaccination and after 6 months of follow-up (Kruskal–Wallis test)